The process of colouring hair with permanent colour takes the form of a chemical reaction of the oxidation of synthetic pigments under the cuticle in the cortex. With permanent colour we can completely change the natural hair colour and in the case of grey hair, we provide it with the necessary pigments and we colour it 100 %.

Hair colours contain synthetic pigments which only colour the hair when they oxidise in the inside of the hair, so therefore we call these colour oxidisers. In these are found two types of synthetic pigments which we call the pre-colouring stage. These are not coloured and only under the influence of hydrogen peroxide in the inside of the hair do they connect amongst themselves, and then they oxidise and colour the hair.

In addition to the synthetic pigments, these colours also contain a fixed percentage of ammonia, which has an alkaline effect and opens the cuticle scales. The hair swells up and the colour mass, colour and hydrogen peroxide can find their way into the inside of the hair (cortex). The alkaline reaction of the ammonia interrupts the stabilising bond in the hydrogen peroxide solution and and triggers its oxidising activity.

In the meantime, pre-stage colours consist of small molecules which can make their way to the inside of the hair whilst the oxidised colours consist of large molecules which can no longer make their way outwards through the opened cuticle. Following colouring and rinsing when we remove the colour, the cuticle remains colourless. However, through the transparent cuticle we can see colour in the cortex.